What is the role of atp in the process of active transport A- It provides energy that cells need to move molecules against a concentration gradient
B- It lengthens the fatty acid chains in the cell membrane
C-It weakens the cell membrane allowing molecules to pass through more easily
D- It provides the nervy to transport the cell in its environment

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Aflashlight produces light using energy from the batteries. in which order does the energy change form? a. from chemical to electric to light energy b. from electric to light to chemical energy c. from electric to chemical to light energy d. from light to electric to chemical energy

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms